超流费米气体的约瑟夫森振荡
Josephson oscillation of a superfluid Fermi gas
摘要：
利用含时三维平均场模型的完全数值解，研究了零温下超流费米气体（SFG）的Josephson振荡，SFG形成于轴对称谐波势和一维周期光晶格势的组合势中，沿轴向光晶格轴移动谐波势阱后，SFG的Josephson振荡.我们研究了约瑟夫森频率对OL势强度的依赖关系。如Cataliotti等人[Science 293（2001）843]对玻色-爱因斯坦凝聚体的实验和Pezze等人[Phys.Rev.Lett. 93（2004）120401]中描述。我们证明了约瑟夫森振荡的SFG的谐波陷阱的大位移的崩溃。SFG约瑟夫森振荡的这些特性可以通过实验来检验。
英文摘要：
Using the complete numerical solution of a time-dependent three-dimensional mean-field model we study the Josephson oscillation of a superfluid Fermi gas (SFG) at zero temperature formed in a combined axially-symmetric harmonic plus one-dimensional periodic optical-lattice (OL) potentials after displacing the harmonic trap along the axial OL axis. We study the dependence of Josephson frequency on the strength of the OL potential. The Josephson frequency decreases with increasing strength as found in the experiment of Cataliotti et al. [Science 293 (2001) 843] for a Bose-Einstein condensate and of the experiment of Pezze et al. [Phys. Rev. Lett. 93 (2004) 120401] for an ideal Fermi gas. We demonstrate a breakdown of Josephson oscillation in the SFG for a large displacement of the harmonic trap. These features of Josephson oscillation of a SFG can be tested experimentally.
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